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This guided inquiry three-part activity engages learners in thinking about the mechanism of natural selection through data collection and pattern recognition.

In this activity, learners grow germs collected from their hands and other objects. They cultivate the germs on a growth medium (such as slices of grapefruit or processed cheese) for a week.

In this activity, learners discover why only some types of plastic can be recycled.

Learners take a field trip along a local body of water and conduct a visual survey to discover information about local land use and water quality.

In this experiment, learners examine the way oil affects bird feathers and test different cleanup methods to find out which works best.

In this web-based activity, learners try to figure out who in an online chat room has their matching puzzle piece.